Duplex steels are the latest group of tempered steels. Duplex stainless steels are designated “duplex” (or austenitic-ferritic) since they have a two-stage micro-structure comprising of grains of ferritic and austenitic treated steel. They are utilized for their great mechanical properties.
Duplex Steel are normally partitioned in three gatherings:
1. Standard Duplex, commonly Grade EN 1.4462. It was the first one to be developed and represents the “mid-range” of properties and is the most utilized duplex steel today. Ex: https://www.numaxsteels.com/duplex-steel-uns-s32205-sheets-plates-coils.php
2. Super-duplex typically grades EN 1.4410 up to supposed Hyper duplex evaluations grew later to satisfy the explicit needs of the oil & gas just as those of the chemical industries. They offer a prevalent corrosion opposition and strength however are progressively hard to process on the grounds that they have higher contents of Cr, Ni, Mo, N, and even W promote the formation of intermetallic stages, which diminish radically the impact obstruction of the steel. Defective preparing will bring about poor performance and users are encouraged to deal with trustworthy suppliers/processors. Applications incorporate deepwater seaward oil creation.
3. Lean Duplex grades, normally level EN 1.4362, have been grown recently for less requesting applications, especially in the building and construction industry. Their corrosion opposition is nearer to that of the standard austenitic evaluation EN 1.4401 and their mechanical properties are higher. This can be an incredible preferred advantage when strength is important. This is the situation in bridges, pressure vessels or tie bars.
Duplex Stainless Steel has quite a lot of applications in these industry categories:
- Chemical Process
- Petrochemical
- Oil & Gas
- Pharmaceutical
- Geothermal
- Sea Water
- Water Desalination
- LNG (Liquefied Natural Gas)
- Biomass
- Mining
- Utilities
- Nuclear Power
- Solar Power
Duplex Stainless Steel is suitable for many industrial processes. A few environments in which it is fully resistant are:-
- Ammonium Bicarbonate
- Ammonium Bromide
- Ammonium Carbonate
- Ammonium Hydroxide
- Ammonium Oxalate
- Ammonium Phosphate
- Ammonium Sulfate
- Ammonium Sulfide
- Ammonium Sulfite
- Benzoic Acid
- Calcium Chloride
- Calcium Hydroxide
- Calcium Nitrate
- Carbon Tetrachloride
- Chlorobenzene
- Copper Acetate
- Copper Carbonate
- Copper Cyanide
- Cupric Chloride
- Ethyl Chloride
- Gallic Acid
- Magnesium Carbonate
- Magnesium Chloride
- Magnesium Sulfate
- Malic Acid
- Mercuric Cyanide
- Mercuric Nitrate
- Nitric Acid
- Nitrous Acid
- Perchloric Acid
- Phosphoric Acid
- Picric Acid
- Potassium Bromide
- Potassium Cyanide
- Potassium Dichromate
- Potassium Hydroxide
- Potassium Iodide
- Potassium Oxalate
- Potassium Permanganate
- Potassium Sulfate
- Pyrogallic Acid
- Quinine Bisulfate (Dry)
- Quinine Sulfate (Dry)
- Silver Bromide
- Silver Nitrate
- Sodium Acetate
- Sodium Bicarbonate
- Sodium Bisulfate
- Sodium Bromide
- Sodium Chlorate
- Sodium Chlorite
- Sodium Nitrate
- Sodium Nitrite
- Sodium Peroxide
- Sodium Silicate
- Sodium Sulfate
- Sodium Sulfide
- Sodium Sulfite
- Stannic Chloride
- Sulfuric Acid
- Sulfurous Acid
- Urea
- Zinc Chloride
- Zinc Sulfate